ArduPlane: option to keep landing throttle at thr_min during flare and touchdown, not zero.

ArduPlane/servos.cpp

@@ -469,8 +469,11 @@ void Plane::set_servos_controlled(void)
             SRV_Channels::set_output_scaled(SRV_Channel::k_throttleRight, 0);
         }
     } else if (suppress_throttle()) {
-        // throttle is suppressed in auto mode
-        SRV_Channels::set_output_scaled(SRV_Channel::k_throttle, 0);
+        SRV_Channels::set_output_scaled(SRV_Channel::k_throttle, 0 ); // default
+        // throttle is suppressed (above) to zero in final flare in auto mode, but we allow instead thr_min if user prefers, eg turbines:
+        if (landing.is_flaring() && landing.use_thr_min_during_flare() ) {
+            SRV_Channels::set_output_scaled(SRV_Channel::k_throttle, aparm.throttle_min.get());
+        }
         if (g.throttle_suppress_manual) {
             // manual pass through of throttle while throttle is suppressed
             SRV_Channels::set_output_scaled(SRV_Channel::k_throttle, get_throttle_input(true));

libraries/AP_Landing/AP_Landing.cpp

@@ -143,7 +143,7 @@ const AP_Param::GroupInfo AP_Landing::var_info[] = {
     // @Path: AP_Landing_Deepstall.cpp
     AP_SUBGROUPINFO(deepstall, "DS_", 15, AP_Landing, AP_Landing_Deepstall),
 
-    // @Param: _OPTIONS
+    // @Param: OPTIONS
     // @DisplayName: Landing options bitmask
     // @Description: Bitmask of options to use with landing.
     // @Bitmask: 0: honor min throttle during landing flare